If you're not on urgent mode, just wait for your statement.
Let wait till the statement is 0.
There could be a refund or cash back or something.

Most importantly, request  a letter from the bank for confirmation of termination.
Then, after 10th or 15th of next month, your CCRIS should clear already

You cannot say so it is already done.
Some of the bank just help you to "block" your card only, meaning that you can "unblock" your card if wish to continue back to use.
This will still count in CCRIS there.

So better to request for letter or email (anything with black n white). Cannot trust too much for the people unless they screenshot to the system with permanent cancellation.

Else, talk shiok sendiri and everybody can say already cancel.